Xiaomi announced the Smart Band 9 Pro fitness band and the round Watch S4 smartwatch in October 2024. They are different kinds of wearables: the band pairs a rectangular display and built-in satellite positioning with a battery-life claim of up to 21 days, while Watch S4 adds smartwatch features whose availability can depend on region, phone, apps and software. The launch prices reported at the time were for China, not current prices in other markets.
What Xiaomi launched
Xiaomi’s corporate announcement places both products’ launches in October 2024. Contemporary coverage identifies the China-market launch on October 29. The Smart Band 9 Pro is a fitness band; the Watch S4 is a round smartwatch. Xiaomi also reported that global wearable product shipments increased by over 50% year over year in the third quarter of 2024. That figure is Xiaomi’s company-reported statistic, not an independent market estimate. Xiaomi’s announcement.
Smart Band 9 Pro specifications
Xiaomi’s global specification sheet lists a 1.74-inch AMOLED touchscreen at 336 × 480 pixels, with maximum brightness of 1,200 nits. The frame is aluminum alloy, and the shell is high-strength fiber polymer. Xiaomi Smart Band 9 Pro specifications.
| Specification | Smart Band 9 Pro |
|---|---|
| Display | 1.74-inch AMOLED touchscreen; 336 × 480 pixels; maximum 1,200 nits |
| Positioning | GNSS with BeiDou, GPS, GLONASS, Galileo and QZSS |
| Connectivity | Bluetooth 5.4 |
| Sensors listed | Accelerometer, gyroscope, electronic compass, optical heart-rate sensor, pulse oximeter and ambient-light sensor |
| Water resistance | 5ATM; Xiaomi describes supported shallow-water uses and exclusions below |
| Battery and charging | 350mAh; magnetic charging; approximately 75 minutes to charge, according to Xiaomi |
| Strap materials | TPU or calfskin, according to Xiaomi’s specification sheet |
| Phone compatibility | Android 8.0 or later, or iOS 12.0 or later |
What 5ATM means for swimming
The 5ATM rating does not mean the band is suitable for every kind of water exposure. Xiaomi says it is suitable for pools, near-shore swimming and other shallow-water activity, but not hot showers, saunas, diving or direct impact from swift currents. The company also warns that water resistance can decline over time. Check Xiaomi’s water-resistance guidance before choosing an activity.
#1 Best Overall
- 1.74" narrow-edge quadrilateral display with 2.5D cover glass
- Aluminum alloy frame in 3 colours, to match a vibrant style
- Up to 21 days of battery life, 5ATM water resistance
- Upgraded all-round sleep monitoring, Improved bloodoxygen and heartrate monitoring
- Supports 150+ sportsmodes, built-in GNSS and compass, Independent GNSS ,five-satellite positionin, Supports five major satellite systems (GPS, GLONASS, BeiDou, Galileo, QZSS), with a 33% increase in positioning accuracy
Smart Band 9 Pro battery claims
Xiaomi UK advertises up to 21 days of battery life and describes that as a 50% improvement over the previous product. The same page gives shorter estimates for more demanding configurations: up to 8 days in heavy-load mode and up to 10 days with the always-on display (AOD). These are manufacturer estimates under Xiaomi’s stated test conditions, which account for display behavior, health monitoring, notifications and exercise recording; they are not guaranteed runtimes or independent test results. Xiaomi UK’s battery details.
For a practical comparison, match the mode to how you plan to use the band. The 21-day headline is not the relevant estimate if you intend to use AOD or a heavy load of features; Xiaomi’s published estimates for those modes are 10 and 8 days, respectively.
Rank #2
- 1.74" narrow-edge quadrilateral display with 2.5D cover glass
- Aluminum alloy frame in 3 colours, to match a vibrant style
- Up to 21 days of battery life, 5ATM water resistance
- Upgraded all-round sleep monitoring, Improved bloodoxygen and heartrate monitoring
- Supports 150+ sportsmodes, built-in GNSS and compass, Independent GNSS ,five-satellite positionin, Supports five major satellite systems (GPS, GLONASS, BeiDou, Galileo, QZSS), with a 33% increase in positioning accuracy
Watch S4 features and dependencies
Watch S4’s contactless Mastercard and Visa payment functionality is not universal: Xiaomi’s Qatar product page says NFC and payment availability varies by region. Treat payment support as a market-specific feature to confirm for the exact watch version and location, rather than assuming it will work wherever the watch is sold. Xiaomi Watch S4 product information.
Smart Hub and connected controls
The same Qatar page says Smart Hub requires a Xiaomi phone or tablet that supports HyperOS 2, with current versions of the Mi Fitness and Xiaomi Home apps. Xiaomi also documents device-specific rollout requirements for controlling Xiaomi Home devices. The feature therefore depends on the particular phone or tablet, software, apps and supported smart-home devices.
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Rank #3
- Stunning images, smooth touch: Immerse yourself in brilliant clarity with the large 1.72-inch AMOLED display.Vacuum filling sealing technology enables symmetrical 2.0mm ultra-thin bezels, expanding screen-to-body ratio from 66% to 73%. Enjoy incredibly smooth and seamless interaction with crisp, color-accurate images, right on your wrist.
- Fast charging, longer adventures: Say goodbye to daily charging hassles! Enjoy an exceptional 21 days of battery life on a single charge. And when you need more power, it only takes an hour to fully recharge the device with fast charging. Freedom without limits!
- Revolutionize your swimming and training sessions: The Xiaomi smartwatch is equipped with a new high-precision electronic compass that tracks swimming direction like never before, delivering unparalleled accuracy for pool sessions. Plus, gain detailed insights through professional analysis of your workouts to optimize each session.
- Master your nighttime recovery: Discover the secrets of your sleep with comprehensive and enhanced sleep monitoring. Get comprehensive insights into your sleep stages and quality, helping you wake up refreshed and optimize your well-being.
- 1500 nits HBM brightness,Glanceable in any light:25% brighter than before, the display achieves a remarkable 1500 nits HBM brightness, making every message readable even in direct sunlight.
Calls and medical use
Xiaomi says the watch must stay connected to a phone over Bluetooth and that voice calls through third-party apps are not supported. The company also states that Watch S4 is not designed for medical purposes. See Xiaomi’s Watch S4 product page for those qualifications.
Bezel and strap kits
Xiaomi’s Qatar page says the standard package comes with a Silver, Black or Rainbow bezel and strap kit; other bezel and strap kits are sold separately. Accessory colors and availability vary by region. Check the local package and confirm the exact Watch S4 compatibility of any replacement kit before buying.
Rank #4
How the two wearables differ
| Buyer consideration | Smart Band 9 Pro | Watch S4 |
|---|---|---|
| Form and screen | Fitness band with a rectangular 1.74-inch AMOLED touchscreen | Round smartwatch; screen dimensions are not stated in the cited Watch S4 product information |
| Exercise positioning | GNSS and five named satellite systems are listed in Xiaomi’s global specifications | Independent GNSS details are not stated in the cited Watch S4 product information |
| Battery evidence in the cited pages | Xiaomi UK claims up to 21 days, with up to 10 days in AOD mode and 8 in heavy-load mode under its test conditions | Battery-life figure is not stated in the cited Watch S4 product information |
| Connected features | Bluetooth 5.4 is listed; no comparable NFC or Smart Hub claim is established by the cited band specification sheet | Payment and Smart Hub features have region, device, app or software dependencies |
| Water use | 5ATM, with Xiaomi’s stated shallow-water uses and exclusions | Water-resistance details are not stated in the cited Watch S4 product information |
| Accessories | Xiaomi lists TPU/calfskin strap materials and magnetic charging | Standard bezel/strap kit varies; additional kits are sold separately, with regional availability varying |
These distinctions make the band the more clearly specified option for someone prioritizing a compact fitness tracker with documented GNSS and a long-duration battery claim. Watch S4 is the round smartwatch choice if its connected functions suit your phone and region. The cited product information does not establish a like-for-like battery or water-resistance comparison, so those points should not be inferred from the band’s specifications.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.China launch prices—and what they do not tell you
Gadgets 360 reported these China-market launch prices on October 30, 2024. They describe the original Chinese launch, not current global or local retail pricing. Gadgets 360’s launch report.
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Best Value
- Stunning 1.74" AMOLED Display with 2000 nits Peak Brightness Experience vivid visuals on the large 1.74-inch AMOLED screen with up to 2000 nits peak brightness – 33% brighter than previous models. Ultra-narrow symmetrical bezels and 60Hz smooth refresh rate deliver crisp, color-accurate images that are easily readable even under direct sunlight.
- Up to 21-Day Battery Life with Fast Charging Go longer between charges with up to 21 days of battery life on light usage (15 days normal, 8 days with always-on display). When you do need power, fast charging gets you back to full in just over an hour – perfect for busy lifestyles and extended adventures.
- Advanced Health Monitoring – Track Your Body Metrics Around the Clock Stay on top of your fitness with 24/7 heart rate tracking, blood oxygen monitor (SpO₂), stress monitoring, and detailed sleep stage tracking with HRV insights. Women’s health tracking is also included, giving you a complete view of your body’s daily status.
- 150+ Sports Modes & Professional Running Watches for Men & Women Whether you’re a runner, cyclist, or swimmer, this band covers 150+ workout modes with independent 5 satellite GNSS positioning for accurate route tracking. Dedicated running track mode, underwater heart rate monitoring, and Bluetooth heart rate broadcast make it an ideal companion for serious athletes – especially those looking for running watches for men.
- Premium Ultra Slim Design with Aluminum Alloy Frame At just 9.7mm thick and weighing only 21.6g (standard edition) or 28.7g (ceramic edition), the Smart Band 10 Pro features a high strength aluminum alloy frame for durability without bulk. A premium ceramic edition is also available for added elegance.
| Product and launch option | China launch price reported October 30, 2024 |
|---|---|
| Smart Band 9 Pro with TPU strap | CNY 399 |
| Smart Band 9 Pro with leather strap | CNY 449 |
| Watch S4, listed standard strap options | CNY 999 |
| Watch S4, specified strap/eSIM options | CNY 1,199 |
Those figures cannot establish what either product costs now in another country. Compare the exact regional model, package, stock status and local price before deciding; do not treat a converted China launch price as a current retail offer.
Quick Recap
Which one should you consider?
- Choose the Smart Band 9 Pro as the closer fit if you want a rectangular fitness-band format, built-in GNSS, listed heart-rate and pulse-oximeter sensors, and a battery estimate tied to a specific mode.
- Consider Watch S4 if you prefer a round smartwatch and have checked that the specific payment or Smart Hub features you want are available for your region and compatible Xiaomi devices.
- For swimming or other water activity, apply Xiaomi’s stated limits for the band; the available cited Watch S4 information does not establish a comparable water rating.
- For either product, use an actual local listing for the matching version and package to assess price and accessory availability.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
